Problems with rounding giving too many digits












1












$begingroup$


My current code is:



round = .1;

f[x_] := x + 4 - Sqrt[3 x^2 - 5]

xx = Solve[f[x] == 0, Reals];

StringForm["x=`1`", 

If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round], 

"none"]]



x=5.800000000000001`




which i want to give me an output of "x = 5.8" instead.



Any advice would be appreciated.






formatting round







share|improve this question











$endgroup$












  • $begingroup$
    StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
    $endgroup$
    – Bob Hanlon
    1 hour ago










  • $begingroup$
    Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
    $endgroup$
    – Daniel Lichtblau
    1 hour ago
















1












$begingroup$


My current code is:



round = .1;

f[x_] := x + 4 - Sqrt[3 x^2 - 5]

xx = Solve[f[x] == 0, Reals];

StringForm["x=`1`", 

If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round], 

"none"]]



x=5.800000000000001`




which i want to give me an output of "x = 5.8" instead.



Any advice would be appreciated.






formatting round







share|improve this question











$endgroup$












  • $begingroup$
    StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
    $endgroup$
    – Bob Hanlon
    1 hour ago










  • $begingroup$
    Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
    $endgroup$
    – Daniel Lichtblau
    1 hour ago














1












1








1





$begingroup$


My current code is:



round = .1;

f[x_] := x + 4 - Sqrt[3 x^2 - 5]

xx = Solve[f[x] == 0, Reals];

StringForm["x=`1`", 

If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round], 

"none"]]



x=5.800000000000001`




which i want to give me an output of "x = 5.8" instead.



Any advice would be appreciated.






formatting round







share|improve this question











$endgroup$




My current code is:



round = .1;

f[x_] := x + 4 - Sqrt[3 x^2 - 5]

xx = Solve[f[x] == 0, Reals];

StringForm["x=`1`", 

If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round], 

"none"]]



x=5.800000000000001`




which i want to give me an output of "x = 5.8" instead.



Any advice would be appreciated.






formatting round




formatting round






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 1 hour ago









Alexey Popkov

38.5k4108263




38.5k4108263










asked 2 hours ago









WomblesWombles

584




584












  • $begingroup$
    StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
    $endgroup$
    – Bob Hanlon
    1 hour ago










  • $begingroup$
    Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
    $endgroup$
    – Daniel Lichtblau
    1 hour ago


















  • $begingroup$
    StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
    $endgroup$
    – Bob Hanlon
    1 hour ago










  • $begingroup$
    Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
    $endgroup$
    – Daniel Lichtblau
    1 hour ago
















$begingroup$
StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
$endgroup$
– Bob Hanlon
1 hour ago




$begingroup$
StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
$endgroup$
– Bob Hanlon
1 hour ago












$begingroup$
Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
$endgroup$
– Daniel Lichtblau
1 hour ago




$begingroup$
Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
$endgroup$
– Daniel Lichtblau
1 hour ago










3 Answers
3






active

oldest

votes


















3












$begingroup$

You could add a StandardForm wrapper:



StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



x=5.8







share|improve this answer









$endgroup$













  • $begingroup$
    Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
    $endgroup$
    – Wombles
    1 hour ago



















2












$begingroup$

StringForm["x=`1`", If[Length[xx] >= 1, 

  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 

  "none"]]



x = 5.8




Same result with NumberForm in place of DecimalForm.






share|improve this answer











$endgroup$













  • $begingroup$
    Thank you, this worked great
    $endgroup$
    – Wombles
    14 mins ago



















1












$begingroup$

StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]



x = 5.8







share|improve this answer









$endgroup$













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    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    3












    $begingroup$

    You could add a StandardForm wrapper:



    StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



    x=5.8







    share|improve this answer









    $endgroup$













    • $begingroup$
      Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
      $endgroup$
      – Wombles
      1 hour ago
















    3












    $begingroup$

    You could add a StandardForm wrapper:



    StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



    x=5.8







    share|improve this answer









    $endgroup$













    • $begingroup$
      Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
      $endgroup$
      – Wombles
      1 hour ago














    3












    3








    3





    $begingroup$

    You could add a StandardForm wrapper:



    StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



    x=5.8







    share|improve this answer









    $endgroup$



    You could add a StandardForm wrapper:



    StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



    x=5.8








    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered 1 hour ago









    Carl WollCarl Woll

    69.4k393179




    69.4k393179












    • $begingroup$
      Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
      $endgroup$
      – Wombles
      1 hour ago


















    • $begingroup$
      Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
      $endgroup$
      – Wombles
      1 hour ago
















    $begingroup$
    Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
    $endgroup$
    – Wombles
    1 hour ago




    $begingroup$
    Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
    $endgroup$
    – Wombles
    1 hour ago











    2












    $begingroup$

    StringForm["x=`1`", If[Length[xx] >= 1, 
    
  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 
    
  "none"]]



    x = 5.8




    Same result with NumberForm in place of DecimalForm.






    share|improve this answer











    $endgroup$













    • $begingroup$
      Thank you, this worked great
      $endgroup$
      – Wombles
      14 mins ago
















    2












    $begingroup$

    StringForm["x=`1`", If[Length[xx] >= 1, 
    
  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 
    
  "none"]]



    x = 5.8




    Same result with NumberForm in place of DecimalForm.






    share|improve this answer











    $endgroup$













    • $begingroup$
      Thank you, this worked great
      $endgroup$
      – Wombles
      14 mins ago














    2












    2








    2





    $begingroup$

    StringForm["x=`1`", If[Length[xx] >= 1, 
    
  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 
    
  "none"]]



    x = 5.8




    Same result with NumberForm in place of DecimalForm.






    share|improve this answer











    $endgroup$



    StringForm["x=`1`", If[Length[xx] >= 1, 
    
  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 
    
  "none"]]



    x = 5.8




    Same result with NumberForm in place of DecimalForm.







    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited 1 hour ago

























    answered 1 hour ago









    kglrkglr

    187k10203421




    187k10203421












    • $begingroup$
      Thank you, this worked great
      $endgroup$
      – Wombles
      14 mins ago


















    • $begingroup$
      Thank you, this worked great
      $endgroup$
      – Wombles
      14 mins ago
















    $begingroup$
    Thank you, this worked great
    $endgroup$
    – Wombles
    14 mins ago




    $begingroup$
    Thank you, this worked great
    $endgroup$
    – Wombles
    14 mins ago











    1












    $begingroup$

    StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]



    x = 5.8







    share|improve this answer









    $endgroup$


















      1












      $begingroup$

      StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]



      x = 5.8







      share|improve this answer









      $endgroup$
















        1












        1








        1





        $begingroup$

        StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]



        x = 5.8







        share|improve this answer









        $endgroup$



        StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]



        x = 5.8








        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 1 hour ago









        mjwmjw

        5228




        5228






























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